morphology.segment_skeleton returned segment_objects to list

[HaleySchuhl]

Describe your changes
The segment_objects returned by pcv.morphology.segment_skeleton is supposed to be a list of OpenCV contours. This change casts the tuple type list of objects into a proper list type object.

Type of update
Is this a:

• Bug fix

Associated issues

• closes fill segments --> fill_segments.py --> line 38 #1719

Additional context
It appears that something upstream changed within cv2.findContours which formats the contours inside a tuple. This causes an error downstream within the pcv.morphology.fill_segments analysis function, since tuple type objects are not supported with the operation .copy() which the function does to preserve the input list of objects/contours.

For the reviewer
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[deepsource-io]

Here's the code health analysis summary for commits 598a347..8623f95. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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[k034b363]

Using a different image and my own code, I can replicate the error described by the issue that prompted this change. The modification made in this PR fixes it and allows for downstream use of the objects from segment_skeleton.